John (Beltose 2nd Baron St John) St John
- Yes, date unknown
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| Henry (2nd Earl of Peterborough) Mordaunt | |
| D: | 1697 |
 | Penelope O'brien -Yes, date unknown |
| Penelope O'brien | |
| D: | Yes, date unknown |
| John (of Avalon) 1st Viscount Mordaunt 1626-1675 |
| John (of Avalon) 1st Viscount Mordaunt | |
| B: | 18 Jun 1626 |
| D: | 5 Jun 1675 |
| Elizabeth (of Monmouth) Carey Abt 1633-1679 |
| Elizabeth (of Monmouth) Carey | |
| B: | Abt 1633 |
| M: | Abt 1656 |
| D: | 5 Apr 1679 |
| Elizabeth (of Effingham) Howard 1603-Yes, date unknown |
| Elizabeth (of Effingham) Howard | |
| B: | 19 Jan 1603 |
| D: | Yes, date unknown |
| John (1st Earl of Peterborough) Mordaunt | |
| D: | 1642 |
| Anne St John -1638 |
| Anne St John | |
| D: | 7 Jun 1638 |
| Westminster Abbey | |
| William (of Effingham) 3rd Lord Howard 1577-1615 |
| William (of Effingham) 3rd Lord Howard | |
| B: | 27 Dec 1577 |
| D: | 28 Nov 1615 |
| Dspm | |
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| John (Beltose 2nd Baron St John) St John -Yes, date unknown |
| John (Beltose 2nd Baron St John) St John | |
| D: | Yes, date unknown |
| Catherine Dormer -Yes, date unknown |
| Catherine Dormer | |
| D: | Yes, date unknown |